#include"Date.h"
Date::Date(int year, int month, int day)
{
	_year = year;
	_month = month;
	_day = day;
}
int Date::GetMonthDay(int year, int month)
{
	int arr[13] = { 0,31,28,31,30,31,30,31,31,30,31,30,31 };
	if ((((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) && month == 2)
	{
		return 29;
	}
	else
		return arr[month];
}
Date::~Date()
{
	_year = 0;
	_month = 0;
	_day = 0;
}
void Date::Print()
{
	cout << _year << "-" << _month << "-" << _day << endl;
}
Date::Date(const Date& d)
{
	_year = d._year;
	_month = d._month;
	_day = d._day;
}
Date& Date::operator=(const Date& d)
{
	_year = d._year;
	_month = d._month;
	_day = d._day;
	return *this;
}
Date& Date::operator+=(int day)
{
	_day += day;
	while (_day > GetMonthDay(_year, _month))
	{
		_day -= GetMonthDay(_year, _month);
		_month++;
		if (_month == 13)
		{
			++_year;
			_month = 1;
		}
	}
	return *this;
}
Date Date::operator-(int day)
{
	Date ret(*this);
	ret._day -= day;
	while (ret._day <= 0)
	{
		ret._month--;
		if (ret._month <= 0)
		{
			ret._year -= 1;
			ret._month = 12;
		}
		ret._day += GetMonthDay(ret._year, ret._month);
	}
	return ret;
}
Date Date::operator+(int day)
{
	Date ret(*this);
	ret._day += day;
	while (ret._day > GetMonthDay(ret._year, ret._month))
	{
		ret._day -= GetMonthDay(ret._year, ret._month);
		ret._month++;
		if (ret._month > 12)
		{
			ret._year += 1;
			ret._month = 1;
		}
	}
	return ret;
}
Date& Date::operator-=(int day)
{
	_day -= day;
	while (_day <= 0)
	{
		_month--;
		if (_month <= 0)
		{
			_year -= 1;
			_month = 12;
		}
		_day += GetMonthDay(_year, _month);
	}
	return *this;
}
Date& Date::operator++()
{
	_day += 1;
	return *this;
}
Date Date::operator++(int)
{
	Date temp(*this);
	_day += 1;
	return temp;
}
Date Date::operator--(int)
{
	Date temp(*this);
	_day -= 1;
	return temp;
}
Date& Date::operator--()
{
	_day -= 1;
	return *this;
}
bool Date::operator>(const Date& d)
{
	if (_year > d._year)
	{
		return true;
	}
	else if (_month > d._month)
	{
		return true;
	}
	else if (_day > d._day)
	{
		return true;
	}
	return false;
}
bool Date::operator==(const Date& d)
{
	return _year == d._year && _month == d._month && _day == d._day;
}
bool Date::operator>=(const Date& d)
{
	return *this > d || *this == d;
}
bool Date::operator<(const Date& d)
{
	if (_year < d._year)
		return true;
	else if (_month < d._month)
		return true;
	else if (_day < d._day)
		return true;
	return false;
}
bool Date::operator<=(const Date& d)
{
	return *this < d || *this == d;
}
bool Date::operator!=(const Date& d)
{
	return _year != d._year || _month != d._month || _day != d._day;
}